As in added measure of security, you must be using the same CD key you used to create a character in order to log in that character. We realize this can be very inconvenient to some people's accounts, so we've added a few chat commands:

"/disablesecurity" - Disables CD key check for character. (must be logged in using original cd key to do this)"/enablesecurity" - Re-enables CD key check for character."/checksecurity" - Check whether or not security is enabled/disabled.